ultrasonic_sensor.ino

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

#define SOUND_VELOCITY 0.034
long duration;
float distanceCm;

// Update these with values suitable for your network.

const char* ssid = "LSKKWorks";
const char* password = "1234567890";
const char* mqtt_server = "192.168.7.2";
int mqtt_port = 1883;
const char* mqtt_user = "camera";
const char* mqtt_pass = "camera";
const char* mqtt_topic = "sensor/1";

const char* CL = "b2da3fb1-7b7f-43f5-bbae-21f3e0c6a7b7_MEGABOT_Sensor_01";//nama alat
String guid = "b2da3fb1-7b7f-43f5-bbae-21f3e0c6a7b7";
int loop_count  = 0 ;
const int input1 = D1;
const int input2 = D2;


byte mac[6];
String MACAddress;
uint8_t MAC_array[6];
char MAC_char[18];

String button_status[8];

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)
char msg[MSG_BUFFER_SIZE];
int value = 0;

String mac2String(byte ar[]) {
  String s;
  for (byte i = 0; i < 6; ++i)
  {
    char buf[3];
    sprintf(buf, "%2X", ar[i]);
    s += buf;
    if (i < 5) s += ':';
  }
  return s;
}

void printMACAddress() {
  WiFi.macAddress(mac);
  MACAddress = mac2String(mac);
  Serial.println(MACAddress);
}

void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  WiFi.macAddress(MAC_array);
  for (int i = 0; i < sizeof(MAC_array) - 1; ++i) {
    sprintf(MAC_char, "%s%02x:", MAC_char, MAC_array[i]);
  }
  sprintf(MAC_char, "%s%02x", MAC_char, MAC_array[sizeof(MAC_array) - 1]);
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // Switch on the LED if an 1 was received as first character
  if ((char)payload[0] == '1') {
    digitalWrite(BUILTIN_LED, LOW);   // Turn the LED on (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is active low on the ESP-01)
  } else {
    digitalWrite(BUILTIN_LED, HIGH);  // Turn the LED off by making the voltage HIGH
  }

}

void reconnect() {
  printMACAddress();
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(CL, mqtt_user, mqtt_pass)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  Serial.begin(115200);

  pinMode(input1, OUTPUT);
  pinMode(input2, INPUT);

  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

void loop() {

  String pubmsg = "";

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  delay(1000);
  digitalWrite(input1, LOW);
  delayMicroseconds(2);
  digitalWrite(input1, HIGH);
  delayMicroseconds(2);
  digitalWrite(input1, LOW);
  duration = pulseIn(input2, HIGH);
  distanceCm = duration * SOUND_VELOCITY/2;

  pubmsg = guid + "#" + String(distanceCm);

  Serial.print("Publish message: ");
  Serial.println(pubmsg);
  client.publish(mqtt_topic, pubmsg.c_str());
}